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Conditions of Use

The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. Permission to use this dataset is granted to the Data User free of charge subject to the following terms:

1) Acceptable use. Use of the dataset will be restricted to academic, research, educational, government, recreational, or other not-for-profit professional purposes. The Data User is permitted to produce and distribute derived works from this dataset provided that they are released under the same license terms as those accompanying this Data Set. Any other uses for the Data Set or its derived products will require explicit permission from the dataset owner.
2 ) Redistribution. The data are provided for use by the Data User. The metadata and this license must accompany all copies made and be available to all users of this Data Set. The Data User will not redistribute the original Data Set beyond this collaboration sphere.
3 ) Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly cite the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set. Citation should take the following general form: Creator, Year of Data Publication, Title of Dataset, Publisher, Dataset identifier. For example:

Shaver, G. 1989. Above ground biomass in acidic tussock tundra experimental site, 1989, Arctic LTER, Toolik, Alaska. Arctic LTER, Marine Biological Lab, Woods Hole, Ma 02543. 1989gsttbm 

4 ) Acknowledgement. The Data User should acknowledge any institutional support or specific funding awards referenced in the metadata accompanying this dataset in any publications where the Data Set contributed significantly to its content. Acknowledgements should identify the supporting party, the party that received the support, and any identifying information such as grant numbers. For example:

Data sets were provided by the Arctic LTER. This material is based upon work supported by the National Science Foundation under Grants #DEB-981022, 9211775, 8702328; #OPP-9911278, 9911681, 9732281, 9615411, 9615563, 9615942, 9615949, 9400722, 9415411, 9318529; #BSR 9019055, 8806635, 8507493.

5 ) Notification. The Data User will notify the Data Set Contact when any derivative work or publication based on or derived from the Data Set is distributed. The Data User will provide the data contact with two reprints of any publications resulting from use of the Data Set and will provide copies, or on-line access to, any derived digital products. Notification will include an explanation of how the Data Set was used to produce the derived work.
6 ) Collaboration. The Data Set has been released in the spirit of open scientific collaboration. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

By accepting this Data Set, the Data User agrees to abide by the terms of this agreement. The Data Owner shall have the right to terminate this agreement immediately by written notice upon the Data User's breach of, or non-compliance with, any of its terms. The Data User may be held responsible for any misuse that is caused or encouraged by the Data User's failure to abide by the terms of this agreement.


While substantial efforts are made to ensure the accuracy of data and documentation contained in this Data Set, complete accuracy of data and metadata cannot be guaranteed. All data and metadata are made available "as is". The Data User holds all parties involved in the production or distribution of the Data Set harmless for damages resulting from its use or interpretation.

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data, Dataset via LTER Data Poral
Dataset ID:1979_ArcticLTER_Lakes_physchem.02
Dataset Title:Physical and chemical data for various lakes near Toolik Research Station, Arctic LTER. Summer 1979
Investigator 1: 
First Name:Michael
Last Name:Miller
Address line 2:
Address line 3:
Zip Code:
Investigator 2: 
First Name:Anne
Last Name:Giblin
Investigator 3: 
First Name:Neil
Last Name:Bettez
Address line 2:
Address line 3:
Zip Code:
Investigator 4: 
First Name:Bernard
Last Name:Moller
Associate Investigators:
Keywords:chemistry, depth, pH, conductivity, temperature, photosynthetically active radiation, light, dissolved oxygen, chlorophyll, chlorophyll a, aquatic ecosystems, arctic, freshwater, irradiance, lakes, limnology, oxygen, specific conductivity, inorganic nutrients, arctic lakes
Abstract:Yearly file describing the physical/chemical values recorded at various lakes near Toolik Research Station. Sample site descriptors include site, date, time, depth. Depth profiles of physical measures collected in situwith Hydrolab Datasonde in the field include temperature, conductivity, pH, dissolved oxygen in both percent saturation and mg/l, SCUFA chlorophyll-a values in both volts and g/l, and PAR.
For questions about the Metadata and data contact the Investigators.
For information about this web site contact:
Arctic LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7496
Online URL:
Data File URL
Data File Name 1979_ArcticLTER_Lakes_physchem
Beginning Date 5/1/1979
End Date 8/31/1979
Number of Data Records 72
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Log of changes: For Archival Use: DATE RECEIVED: 1-5-95 DATA FILE ENTERED BY:Neil Bettez DATA FILE VALIDATION: NAME:Neil Bettez DATE:1-5-95
Version 1: Data from all lakes compiled into one spreadsheet per year. Updated to new metadata form (with sites). CH April 2013
Version 2: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 27Jan14
Location Name Toolik Central  
Geographic Description Toolik Lake, Main Station  
Location Bounding Box    
West Bounding Coordinate    
East Bounding Coordinate    
North Bounding Coordinate    
South Bounding Coordinate    
OR if single point location    
Latitude 68.629961  
Longitude -149.612633  
Elevation 719  
Link to Google Map View on Google Map  
Organisms studied
Methods:For field work and sampling protocols see "Sampling and Field Methods Protocol" on The Arctic LTER webpage ( specific link found below.

Water, physics and chemistry sampled weekly from the main station on Toolik Lake.
Dissolved O2 and temperature were read by YSI model 57 oxygen meter, air calibrated. Temperature and conductivity were read by YSI model 33, conductivity meter. Carbonate alkalinity was titrated against pH depending on expected alkalinity (Wetzel and Likens 1979). pH was measured electrometrically with a corning portable expanded standard pH buffer and corrected for temperature of sample.

Notes: Not all data is available for all years.

Reference Citations: Wetzel, R.G., G.E. Likens. 1979. Limnological Methods. Saunders. Philadelphia.

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Site Site Name: Name of the lake where measurements were taken. There are discrete sampling sites defined by water depth, generally they are at the point of maximum depth. text        
Date Date readings were taken on. datetime   dd-mmm-yyyy    
Time_hr_dst Exact time that each reading was recorded in Alaska Daylight Savings Time (1 hour ahead of Alaska Standard Time: if 13:00 DST than 12:00 AST) datetime   hh:mm:ss   .=Missing or Not Measured
IBVSvr4a_V Internal Battery Voltage of the Surveyor 4a Datalogger. number volt     .=Missing or Not Measured
Temp_C Water temperature at depth. number celsius     .=Missing or Not Measured
Cond_uS Electrical conductivity of the water at depth. number microsiemenPerCentimeter     .=Missing or Not Measured
Dep_m Depth of water measurement taken at starting from the surface as 0. number meter     .=Missing or Not Measured
pH pH (opposite of the log of the hydrogen ion concentration). number dimensionless     .=Missing or Not Measured
DO_Sat The percent saturation of dissolved oxygen at depth. number percent     .=Missing or Not Measured
DO_mg/l The concentration of dissolved oxygen at depth. number milligramPerLiter     .=Missing or Not Measured
Chl_V In Vivo measurement of chlorophyll-a concentration. number volt     .=Missing or Not Measured
Chl_ug/l In Vivo measurement of chlorophyll-a concentration. number microgramPerLiter     .=Missing or Not Measured
PAR_uEm2s PAR (photosynthetically active radiation) measured below the water surface. number microEinsteinPerMeterSquaredPerSecond     .=Missing or Not Measured
refPAR_uEm2s PAR (photosynthetically active radiation) measured with Deck unit to correct for changes in ambient light. number microEinsteinPerMeterSquaredPerSecond     .=Missing or Not Measured
Secchi_m Measure of water transparency by depth a Secchi Disk is visible to. number meter     .=Missing or Not Measured
Hydrolab This field indicates which Hydrolab Datasonde instrument was used to take measurements text        
Notes Any additional information pertaining to measurments made for a particular depth, place and time. text        
Alk Alkalinity (m equivalents/L) number molarity     .=Missing or Not Measured
DO_umoles/L Dissolved oxygen by Winkler Titration number micromolePerLiter     .=Missing or Not Measured

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